PowerShell LRU Cache Class with Bounded Capacity

class LruCache {
    [int]$Capacity
    [System.Collections.Specialized.OrderedDictionary]$Items = [System.Collections.Specialized.OrderedDictionary]::new()

    LruCache([int]$capacity) { $this.Capacity = $capacity }

    [object] Get([string]$key) {
        if (-not $this.Items.Contains($key)) { return $null }
        $value = $this.Items[$key]
        $this.Items.Remove($key); $this.Items.Add($key, $value)  # refresh recency
        return $value
    }

    [void] Set([string]$key, [object]$value) {
        if ($this.Items.Contains($key)) { $this.Items.Remove($key) }
        elseif ($this.Items.Count -ge $this.Capacity) { $this.Items.RemoveAt(0) }
        $this.Items.Add($key, $value)
    }
}